Separator for non-aqueous secondary battery and non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-2019044118-A1
Application number	US-201816044585-A
Country	US
Kind code	A1
Filing date	Jul 25, 2018
Priority date	Aug 3, 2017
Publication date	Feb 7, 2019
Grant date	—

Abstract

A separator for a non-aqueous secondary battery that is composed of a composite membrane containing a porous substrate, and a heat-resistant adhesive porous layer provided on one side or both sides of the porous substrate, in which the heat-resistant adhesive porous layer contains an acrylic type resin, and a heat-resistant resin that has a glass transition temperature of 200° C. or more and that has an amide-structure.

First claim

What is claimed is:

1 . A separator for a non-aqueous secondary battery that is composed of a composite membrane, the composite membrane comprising:
a porous substrate, and a heat-resistant adhesive porous layer provided on one side or both sides of the porous substrate, wherein the heat-resistant adhesive porous layer contains an acrylic type resin, and a heat-resistant resin that has a glass transition temperature of 200° C. or more and that has an amide-structure.

2 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the heat-resistant adhesive porous layer has a structure in which the acrylic type resin having a particle configuration with a size of from 10 nm to 500 nm is dispersed in a porous structure of the heat-resistant resin.

3 . The separator for a non-aqueous secondary battery according to claim 2 , wherein a glass transition temperature of the acrylic type resin is from 0° C. to 80° C.

4 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the heat-resistant adhesive porous layer has a structure in which a surface of the porous structure of the heat-resistant resin and/or inside surface of pores of the porous structure of the heat-resistant resin is coated with the acrylic type resin.

5 . The separator for a non-aqueous secondary battery according to claim 4 , wherein a glass transition temperature of the acrylic type resin is less than 0° C.

6 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the heat-resistant resin is one or more selected from the group consisting of a polyamide imide, a wholly aromatic polyamide, a poly-N-vinylacetamide, a polyacrylamide and a polyetheramide copolymer.

7 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the heat-resistant resin is a para-wholly aromatic polyamide.

8 . The separator for a non-aqueous secondary battery according to claim 1 , wherein a content of the acrylic type resin in the heat-resistant adhesive porous layer is from 5 to 60% by mass with respect to a total mass of the acrylic type resin and the heat-resistant resin.

9 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the heat-resistant adhesive porous layer further contains a polyvinylidene fluoride type resin.

10 . The separator for a non-aqueous secondary battery according to claim 9 , wherein the heat-resistant resin is one or more selected from the group consisting of a polyamide imide, a wholly aromatic polyamide, a poly-N-vinylacetamide, a polyacrylamide and a polyetheramide copolymer.

11 . The separator for a non-aqueous secondary battery according to claim 9 , wherein the heat-resistant resin is a para-wholly aromatic polyamide.

12 . The separator for a non-aqueous secondary battery according to claim 9 , wherein the acrylic type resin is a copolymer containing an acrylic type monomer and a styrene type monomer as monomer components.

13 . The separator for a non-aqueous secondary battery according to claim 9 , wherein the polyvinylidene fluoride type resin is a copolymer containing vinylidene fluoride and hexafluoropropylene as monomer components, a content of the hexafluoropropylene monomer component in the copolymer is from 3 to 20% by mass, and a weight average molecular weight of the copolymer is from 100,000 to 1,500,000.

14 . The separator for a non-aqueous secondary battery according to claim 9 , wherein a content of the polyvinylidene fluoride type resin in the heat-resistant adhesive porous layer is from 5 to 55% by mass with respect to a total mass of the acrylic type resin and the polyvinylidene fluoride type resin.

15 . The separator for a non-aqueous secondary battery according to claim 9 , wherein, in the heat-resistant adhesive porous layer, a content of the heat-resistant resin is from 30 to 80% by mass, a content of the acrylic type resin is from 10 to 40% by mass, and a content of the polyvinylidene fluoride type resin is from 10 to 30% by mass, with respect to a total mass of the heat-resistant resin, the acrylic type resin and the polyvinylidene fluoride type resin.

16 . The separator for a non-aqueous secondary battery according to claim 9 , wherein the heat-resistant adhesive porous layer has a structure in which a mixture that has a particle configuration with a size of from 10 nm to 500 nm and that is composed of the acrylic type resin and the polyvinylidene fluoride type resin is dispersed in a porous structure of the heat-resistant resin.

17 . The separator for a non-aqueous secondary battery according to claim 9 , wherein the heat-resistant adhesive porous layer has a structure in which a surface of the porous structure of the heat-resistant resin and/or inside surface of pores of the porous structure of the heat-resistant resin is coated with a mixture of the acrylic type resin and the polyvinylidene fluoride type resin.

18 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the heat-resistant adhesive porous layer contains a filler in an amount of from 5 to 80% by mass with respect to a total mass of the heat-resistant adhesive porous layer.

19 . The separator for a non-aqueous secondary battery according to claim 1 , wherein an adhesive porous layer containing a polyvinylidene fluoride type resin is further provided on one side or both sides of the composite membrane.

20 . A non-aqueous secondary battery, comprising:
a positive electrode, a negative electrode, and the separator for a non-aqueous secondary battery according to claim 1 , disposed between the positive electrode and the negative electrode, wherein an electromotive force is obtained by lithium doping and dedoping.

Assignees

• Teijin Ltd

Inventors

• Sakurai Hiroshi
• Nishikawa Satoshi
• Akamatsu Tetsuya

Classifications

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/423

  Polyamide resins · CPC title

• H01M50/42 Primary

  Acrylic resins · CPC title

• H01M50/417

  Polyolefins · CPC title